Atari 400 User Manual

44 User's Handbo ok to the Atari 400 / 800 Computers
Numeric Data
Atari BASIC stores all numbers in memory in floating decimal
point form . With floating decimal point numbers , a decimal
point is always assumed. Any number of digits can be placed on
either side of this decimal point. Even w ith numbers with no
decimal position , a decimal point always is assumed following
the number's last digit.
Commas may not be included within numeric data. For examp le,
109000 would be a valid number in Atari BAS IC, while 109,000
would be invalid .
Integer
An integer is a number without a decimal position. Integers can
either be positive or negative. The following are examp l es of
int egers:
-1134
o
1
-1
17945
+32
Negative integers are preceded with the (-) sign. Positive
integers can be prec e ded with the (+) sign, a lth ough integers
without a (+) sign are assumed to be pos iti ve.
In Atari BASIC, inte gers are processed exactly as are any other
floating point numb ers. Atari BASIC doe s not process integers as
a separate form of num eric data.
Floating Point · Numbers
Floating point numbers includ e both integers, as well as decimal
functions and numb e rs with decimal positions. The following
are examp l es of floating point numbers.

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)